2021/01/05 by Masoud Taleb, Taleb, Masoud, Fatemeh Davoodi +6 · 2 citations
Engineering · Materials Science · Physics and Astronomy · #2D Materials and Applications #Applied Physics (physics.app-ph) #FOS: Physical sciences #J.2 #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Molecular Junctions and Nanostructures #Optics (physics.optics) #Strong Light-Matter Interactions
paper · pdf · doi:10.48550/arxiv.2101.01465
openalex publication_date 2021/01/05 · openalex created_date 2022/07/25 · openalex updated_date 2026/07/28
Semiconducting transition-metal dichalcogenides (TMDCs) provide a fascinating\ndiscovery platform for strong light-matter interaction effects in the visible\nspectrum at ambient conditions. While most of the work has focused on\nhybridizing excitons with resonant photonic modes of external mirrors,\ncavities, or nanostructures, intriguingly, TMDC flakes of sub-wavelength\nthickness can themselves act as nanocavities. Here, we determine the optical\nresponse of such freestanding planar waveguides of WSe2, by means of\ncathodoluminescence spectroscopy. We reveal strong exciton-photon interaction\neffects that foster long-range propagating exciton-polaritons and enable direct\nimaging of the energy transfer dynamics originating from cavity-like\nFabry-Perot resonances. Furthermore, confinement effects due to discontinuities\nin the flakes are demonstrated as an efficient means to tailor the\nexciton-photon coupling strength, along the edges of natural flakes. Our\ncombined experimental and theoretical results provide a deeper understanding of\nexciton-photon self-hybridization in semiconducting TMDCs and may pave the way\nto optoelectronic nanocircuits exploiting exciton-photon interaction.\n